Deformed mountain lion
© Idaho Fish and GameThis Dec. 30, 2015, photo released by the Idaho Department of Fish and Game (IDFG), shows a deformed mountain lion with teeth growing out of its forehead. Biologists are trying to determine what caused the strange growth on the animal, which was legally killed by a hunter in southeast Idaho near the Utah border.
Idaho Fish and Game officials were left a little perplexed when a conservation officer sent photos of a mountain lion's odd deformity to them last week.

The cougar was shot near Weston by an unidentified hunter and appears to have a separate set of teeth growing out of its head. It's simply something Fish and Game biologists have never seen before.

There's no clear consensus about what the abnormality is, but there are a few theories.

First, it could be a teratoma, a rare type of tumor capable of containing hair, bone, teeth and even parts of limbs or organs.

Second, it could be what's left of a conjoined twin that possible died in the womb and was absorbed by the mountain lion.

Lastly, it could be the result of an injury to the cougar's teeth or jaw, which didn't heal right.

The cougar is still in the hands of the hunter who plans to have it stuffed and preserved. Idaho Fish and Game hope to carry out a postmortem and perform x-rays to come up with a solid conclusion.